D: ultraviolet
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Water waves refract at a boundary between deep water and shallow water. What is the effect on the frequency, waveleng…
Which statement about the speed of sound is correct?
What is the frequency of a wave?
The speed-time graph represents the journey of a car. The dots separate different sections of the journey. There are …
A steel ball is released just below the surface of thick oil in a cylinder. During the first few centimetres of trave…
A hard stone hits the ground and comes to rest almost immediately. As the stone hits the ground, what is the directio…